Debt Obligations Narrative (Details) - USD ($) $ in Millions	6 Months Ended
Jun. 30, 2021	Jun. 30, 2020
Debt Instrument [Line Items]
Long-term Line of Credit	$ 473.0
Repayments of Long-term Debt	13,425.0	$ 16,769.0
Proceeds from Issuance of Long-term Debt	$ 8,245.0	$ 16,975.0
Banking Regulation, Supplementary Leverage Ratio, Actual	3.14
ETO Credit Facility due December 2022 [Member]
Debt Instrument [Line Items]
Line of Credit Facility, Current Borrowing Capacity	$ 4,020.0
Long-term Line of Credit	886.0
Letters of Credit Outstanding, Amount	$ 90.0
Line of Credit Facility, Interest Rate at Period End	0.52%
Line of Credit Facility, Maximum Borrowing Capacity	$ 5,000.0
Commercial Paper	795.0
ETO Credit Facility due December 2022 [Member] \| Accordion feature [Member]
Debt Instrument [Line Items]
Long-term Line of Credit	6,000.0
ETO 364-day Credit Facility due November 2019 [Member]
Debt Instrument [Line Items]
Long-term Line of Credit	0.0
Line of Credit Facility, Maximum Borrowing Capacity	1,000.0
Sunoco LP $1.5 billion Revolving Credit Facility due July 2023 [Member] \| Sunoco LP [Member]
Debt Instrument [Line Items]
Long-term Line of Credit	1,500.0
Letters of Credit Outstanding, Amount	$ 8.0
Line of Credit Facility, Interest Rate at Period End	2.08%
Line of Credit Facility, Remaining Borrowing Capacity	$ 1,130.0
Line of Credit Facility, Fair Value, Basis for Measurement	361 million
ETO Term Loan [Member]
Debt Instrument [Line Items]
Long-term Line of Credit	$ 500.0
Line of Credit Facility, Interest Rate at Period End	1.10%
Line of Credit Facility, Maximum Borrowing Capacity	$ 2,000.0
SemCAMS C$350 million senior secured term loan facility [Member] \| SemCAMS [Member]
Debt Instrument [Line Items]
Long-term Line of Credit	282.0
Line of Credit Facility, Fair Value of Amount Outstanding	261.0
SemCAMS C$525 million senior secured revolving credit facility [Member] \| SemCAMS [Member]
Debt Instrument [Line Items]
Long-term Line of Credit	424.0
SemCAMS C$300 million senior secured construction loan facility [Member] \| SemCAMS [Member]
Debt Instrument [Line Items]
Long-term Line of Credit	242.0
Line of Credit Facility, Fair Value of Amount Outstanding	82.0
KAPS Facility [Member] \| SemCAMS [Member]
Debt Instrument [Line Items]
Line of Credit Facility, Maximum Borrowing Capacity	202.0
Line of Credit Facility, Fair Value of Amount Outstanding	0.0
4.40% Senior Notes due April 2021 \| ETO [Member]
Debt Instrument [Line Items]
Early Repayment of Senior Debt	$ 600.0
Debt Instrument, Interest Rate, Stated Percentage	4.40%
4.65% Senior Notes due June 2021 \| ETO [Member]
Debt Instrument [Line Items]
Early Repayment of Senior Debt	$ 800.0
Debt Instrument, Interest Rate, Stated Percentage	4.65%
USAC Credit Facility, due 2023 [Member] \| USAC [Member]
Debt Instrument [Line Items]
Line of Credit Facility, Current Borrowing Capacity	$ 1,600.0
Long-term Line of Credit	$ 1,130.0
Line of Credit Facility, Interest Rate at Period End	2.91%
Line of Credit Facility, Maximum Borrowing Capacity	$ 400.0
Canada, Dollars \| SemCAMS C$350 million senior secured term loan facility [Member] \| SemCAMS [Member]
Debt Instrument [Line Items]
Long-term Line of Credit	350.0
Line of Credit Facility, Fair Value of Amount Outstanding	323.0
Canada, Dollars \| SemCAMS C$525 million senior secured revolving credit facility [Member] \| SemCAMS [Member]
Debt Instrument [Line Items]
Long-term Line of Credit	525.0
Canada, Dollars \| SemCAMS C$300 million senior secured construction loan facility [Member] \| SemCAMS [Member]
Debt Instrument [Line Items]
Long-term Line of Credit	300.0
Line of Credit Facility, Fair Value of Amount Outstanding	102.0
Canada, Dollars \| KAPS Facility [Member] \| SemCAMS [Member]
Debt Instrument [Line Items]
Line of Credit Facility, Maximum Borrowing Capacity	$ 250.0

Carrying value as of the balance sheet date of short-term borrowings using unsecured obligations issued by banks, corporations and other borrowers to investors. The maturities of these money market securities generally do not exceed 270 days.

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Contractual interest rate for funds borrowed, under the debt agreement.

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The cash outflow for the extinguishment of long-term borrowing, with the highest claim on the assets of the entity in case of bankruptcy or liquidation, before its maturity.

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The total amount of the contingent obligation under letters of credit outstanding as of the reporting date.

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The carrying value as of the balance sheet date of the current and noncurrent portions of long-term obligations drawn from a line of credit, which is a bank's commitment to make loans up to a specific amount. Examples of items that might be included in the application of this element may consist of letters of credit, standby letters of credit, and revolving credit arrangements, under which borrowings can be made up to a maximum amount as of any point in time conditional on satisfaction of specified terms before, as of and after the date of drawdowns on the line. Includes short-term obligations that would normally be classified as current liabilities but for which (a) postbalance sheet date issuance of a long term obligation to refinance the short term obligation on a long term basis, or (b) the enterprise has entered into a financing agreement that clearly permits the enterprise to refinance the short-term obligation on a long term basis and the following conditions are met (1) the agreement does not expire within 1 year and is not cancelable by the lender except for violation of an objectively determinable provision, (2) no violation exists at the BS date, and (3) the lender has entered into the financing agreement is expected to be financially capable of honoring the agreement.

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Amount of current borrowing capacity under the credit facility considering any current restrictions on the amount that could be borrowed (for example, borrowings may be limited by the amount of current assets), but without considering any amounts currently outstanding under the facility.

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Description of the method(s) used to measure fair value of the amount outstanding under the credit facility and any significant assumptions used in the fair value measurement.

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Fair value of the amount outstanding under the credit facility.

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The effective interest rate at the end of the reporting period.

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Maximum borrowing capacity under the credit facility without consideration of any current restrictions on the amount that could be borrowed or the amounts currently outstanding under the facility.

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Amount of borrowing capacity currently available under the credit facility (current borrowing capacity less the amount of borrowings outstanding).

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The cash inflow from a debt initially having maturity due after one year or beyond the operating cycle, if longer.

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The cash outflow for debt initially having maturity due after one year or beyond the normal operating cycle, if longer.

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Ratio of Tier 1 risk-based capital to total leverage exposure as defined by regulatory framework.

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